@media screen and (max-width:575px) {
    .head {
      display: none;
    }
  
    nav {
      position: fixed !important;
    }
  
    .nav-menu li a {
      font-size: 14px;
    }
  
    .nav-menu li a:hover {
      color: rgb(88, 224, 255);
      scale: 1.1;
      transition: 2s;
    }
  
    .burger {
      display: block;
    }
  
    .footer {
      margin-top: 40px;
      font-size: 15px;
      line-height: 50px;
      font-family: 'footer' !important;
      color: rgb(120 125 241);
    }
  
    .menu-box {
      display: none;
    }
    .nav-menu {
      display: none;
      position: absolute;
      top: 80px;
      right: 0;
      bottom: 0;
      width: 30vw;
      height: 80vw;
  
      background-color: rgba(99, 123, 155, 0.445);
      flex-direction: column;
      justify-content: flex-start;
      align-items: center;
      transform: translatey(100%);
      transition: 0.4s ease-in-out;
    }
    .nav-menu.open {
      margin-right: 10px;
      display: block;
      transform: translatey(0);
    }
    .nav-menu li {
      width: 46% !important;
      margin: 5vh;
      transform: translateX(20px);
      opacity: 0;
    }
    .burger.active div {
      transition: 0.3s ease-in-out 0.3s;
    }
    .burger.active .top-line {
      transform: rotate(45deg) translate(4px, 6px);
    }
    .burger.active .bottom-line {
      transform: rotate(-45deg) translate(4px, -6px);
    }
    .burger.active .middle-line {
      opacity: 0;
      transform: translateX(10px);
      transition: 0.3s ease-in-out;
    }
    @keyframes slideIn {
      from {
        transform: translateX(20px);
        opacity: 0;
      }
  
      to {
        transform: translateX(0);
        opacity: 1;
      }
    }
    body {
      background-color: white;
      background-image: none;
    }
    .nav {
      position: sticky;
    }
    .big_div {
      border: 0px;
      border-radius: 0;
    }
    .big_div_001 {
      display: none;
    }
    .big_div_004{
      display: none;
    }
    .big_div_002 {
      display: block;
      width: 100%;
      margin-top: 100px;
    }
    .big_div_002 .title {
      position: relative;
      top: 25px;
      font-size: 25px;
    }
    .big_div_003 {
      display: block;
      width: 100%;
      margin-top: 100px;
    }
    .big_div_003>.title {
      font-size: 25px;
      margin-bottom: 20px;
    }
    .big_div_003>span {
      color: black;
      font-size: 17px;
    }
    .big_div_003>p {
      margin: auto;
      width: 90%;
      text-align: start;
      text-indent: 2em;
      color: black;
      font-size: 15px;
      margin-bottom: 30px;
      margin-top: 20px;
    }
    .big_div_003>.kong {
      height: 10px;
    }
    .big_div_003>.img img {
      width: 100%;
      overflow: hidden;
      margin-bottom: 10px;
    }
    .small-box {
      border: 1px solid rgb(210, 210, 210);
      position: relative;
      width: 90%;
      height: 250px;
      margin: auto;
      margin-top: 50px;
      margin-bottom: 20px;
      box-shadow: 10px 10px 20px rgb(9 75 82 / 50%);
    }
    .small-box:hover {
      scale: 1.01;
    }
    .box-left {
      position: absolute;
      height: 70%;
      width: 30%;
      left: 30px;
      top: -30px;
    }
    .box-left img {
      margin-top: 30px;
      margin-bottom: 10px;
      border: 2px solid rgb(220, 156, 133);
      width: 100%;
    }
    .box-left span {
      color: rgb(80 111 200);
      margin-top: 10px;
      font-size: 18px;
      font-family: '宋体';
      font-weight: 600;
    }
    .box-right {
      position: absolute;
      right: 10px;
      top: 15px;
      width: 55%;
    }
    .box-right span{
      font-size: 20px;
    }
  
    .box-right p {
      margin-left: 15px !important;
      width: 90%;
      text-indent: 2em;
      text-align: start;
      font-size: 15px !important;
      font-family: 'totoro' !important;
      color: black;
      margin-top: 25px !important;
    }
  
    #first {
      display: none;
    }
  
    .head {
      height: 70px;
    }
  
    footer {
      margin-top: 10px;
      height: 50px;
    }
  
    #base {
      display: none;
    }
  
    #plot {
      display: none;
    }
  
  }
  @media screen and (min-width:576px) {
    #first {
      font-size: 18px;
    }
  
    .nav-menu li a {
      font-size: 15px;
    }
  
    footer {
      height: 50px;
    }
  
    .footer {
      font-size: 20px;
      line-height: 50px;
    }
  
    .box-right p {
      font-size: 10px;
      margin-top: 15px;
    }
  
    .box-left {
      margin-top: 25px;
    }
  
    #base p {
      width: 100%;
      text-indent: 2em;
      font-size: 23px;
    }
  
    #base span {
      font-size: 25px;
    }
  
    #base table {
      width: 100%;
    }
  
    .menu-button {
      width: 50px !important;
      height: 50px !important;
    }
  
    .menu-list {
      width: 150px !important;
      height: 200px !important;
    }
  
    .menu-list span {
      font-size: 19px !important;
    }
  
    .menu-list li {
      padding: 8px !important;
    }
  
    .menu-list .fa {
      width: 15px !important;
    }
  }
  @media screen and (min-width:768px) {
    #first {
      font-size: 20px;
    }
  
    .nav-menu li a {
      font-size: 17px;
    }
  
    footer {
      height: 50px;
    }
  
    .footer {
      font-size: 22px;
      line-height: 50px;
    }
  
    .box-right p {
      font-size: 10px;
      margin-top: 15px;
    }
  
    .box-left {
      margin-top: 30px;
    }
  
    #base p {
      width: 100%;
      text-indent: 2em;
      font-size: 25px;
    }
  
    #base span {
      font-size: 30px;
    }
  
    #base table {
      width: 100%;
    }
  
    .menu-button {
      width: 50px !important;
      height: 50px !important;
    }
  
    .menu-list {
      width: 150px !important;
      height: 200px !important;
    }
  
    .menu-list span {
      font-size: 20px !important;
    }
  
    .menu-list li {
      padding: 10px !important;
    }
  
    .menu-list .fa {
      width: 18px !important;
    }
  }
  @media screen and (min-width:992px) {
    #first {
      font-size: 22px;
    }
  
    .nav-menu li a {
      font-size: 17px;
    }
  
    footer {
      height: 60px;
    }
  
    .footer {
      font-size: 25px;
      line-height: 60px;
    }
  
    .box-right p {
      font-size: 10px;
      margin-top: 15px;
    }
  
    .box-left {
      margin-top: 30px;
    }
  
    #base p {
      width: 90%;
      text-indent: 2em;
      font-size: 30px;
    }
  
    #base span {
      font-size: 30px;
    }
  
    #base table {
      width: 80%;
    }
  
    .menu-button {
      width: 50px !important;
      height: 50px !important;
    }
  
    .menu-list {
      width: 150px !important;
      height: 200px !important;
    }
  
    .menu-list span {
      font-size: 20px !important;
    }
  
    .menu-list li {
      padding: 10px !important;
    }
  
    .menu-list .fa {
      width: 18px !important;
    }
  }
  @media screen and (min-width:1200px) {
    #first {
      font-size: 25px;
    }
  
    footer {
      height: 80px;
    }
  
    .footer {
      font-size: 30px;
      line-height: 80px;
    }
  
    .box-right p {
      font-size: 15px;
      margin-top: 20px;
    }
  
    .box-left {
      margin-top: 30px;
    }
  
    #base p {
      width: 90%;
      text-indent: 2em;
      font-size: 30px;
    }
  
    #base span {
      font-size: 30px;
    }
  
    #base table {
      width: 80%;
    }
  
    .menu-button {
      width: 50px !important;
      height: 50px !important;
    }
  
    .menu-list {
      width: 150px !important;
      height: 200px !important;
    }
  
    .menu-list span {
      font-size: 20px !important;
    }
  
    .menu-list li {
      padding: 10px !important;
    }
  
    .menu-list .fa {
      width: 18px !important;
    }
  }